API Hack Day brings developers together for an all-day coding fest focused on building apps with APIs. Developers of all experience levels can share ideas, collaborate on projects, start new ventures and find out about great tools and new APIs to play with. API Hack Day events are sponsored by a core group of companies that are built on and around APIs, including Mashery, Twilio, Apigee, SimpleGeo, and SendGrid. Most of the companies are located in the San Francisco Bay Area, but we hold API Hack Day events all over the US, coordinating the events with local groups and companies. Everyone is welcome to attend! Whether you're a hacker, designer, entrepreneur, in biz-dev, student, professional, or just plain curious about what's going on in the web/mobile application development universe -- we would love to have you there. API Hack Days is more than just building apps and hacks - it is about building connections with people, learning new skills, and having lots of fun over food and drinks.

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